Art. XT. — Gyphaspis spryi, a New Species of Trilobite 

 fro'in the Silurian of Melbourne. 



By J. W. GREGORY, D.Sc, 



Professor of Geology, Melbotirue University. 



(With Plate XXII.) 



[Eead 4th October, 1900.] 



During the cour.se of some excavations near Government 

 House, South Yarra, Mr. F. P. Spry has obtained an interesting 

 series of fossils from the Melbourne Silurian beds. The most 

 important fossil in the collection is a trilobite represented by 

 three well-preserved specimens and several fragments. Mr. Spry 

 has kindly lent me the material for examination and description. 

 The trilobite is a new species of the genus Cyphaspis, and I have 

 much pleasure in naming it after its discoverer. 



Cyphaspis spryi\ n. sp. 



Descriptio7i. — Body oval. Cephalic .shield broad and short; 

 anterior margin well rounded. Limb of medium width, project- 

 ing in front as a blunt, short spine. 



Glabella tumid ; approximately uniform in width. Of the 

 furrows only the posterior pair is visible; and these two furrows 

 are deep and completely cut off the posterior lobe. The lobes are 

 well rounded behind, and pointed in front. 



Facial suture begins near the genal angle, bends sharply 

 inwards to the eye, and then curves gently outward to the 

 anterior margin, the cranidium being in front, twice the width 

 of the glabella. 



Genal angles developed as short thick spines, directed outward, 

 but continuing the curve of the lateral margin of the cephalic 

 shield. 



